"Alright, little Tim." Kira would clap her hands together once as she bent over slightly to be more leveled with you. "Let's start with some jumping jacks, kay? You just stand right there behind me, and follow my lead."
With that, Kira swirled around and faced the other way, her humongous booty would jiggle furiously by the sudden momentum as it almost defied physics. With you being eye-level with her behind, it was tough not to notice it's sheer size. Even though it wasn't as huge as Sierra's, it wasn't far behind. And her constant workouts may not have reduced it's size, but it sure made it look fuller and rounder.
With the vicious wobbles of her buttcheeks, it caused her tightly clamped shorts to strain and struggle to contain her buttmeat, even such a small thing as turning around was enough to cause her shorts to slide down just a little bit. Showing off a portion of her soaked, sweaty rump. Her gigantic asscrack was big enough to swallow you even at this size.
Kira would look over her shoulder as she'd smile. "Are you ready? Try to keep up, ok?". And with that, she'd start the workout slowly paced, as she'd jump and spread her legs. Her gellatinous cheeks jiggling and wobbling like bubbles of jello as it took them a few seconds to finally settle. She'd then proceed to continue, jumping rapidly as her bubble butt shook furiously in response, desperately trying to escape from the tight prison of her shorts, which had disapeared into her unending asscrack.
A few minutes would pass as she noticed you needed to catch your breath a little. "We'll take a few seconds worth of a breather, and then we'll add some squats to the mix."
You'd nod, appreciating the help you were recieving as you barely had time to catch your breath before she'd tell you to keep going.
She'd continue with her jumping jacks, jumping into the air and clasping her legs together, before jumping once more as she spread her legs wide. Followed by a slow squat as her titanic rump leaned backward, causing her bubbly, sweatsoaked asscrack to make contact with your face, her cheeks sliding past you as you found yourself deep inbetween her cheeks, the strong scent of sweat and stale farts entered your nostrils as you started to cough. Causing your head to feel dizzy.
It didn't take long until your body stopped responding, and you soon felt yourself shrinking down rapidly, your molecules focusing on a single point which happened to be your nose, until you were only an inch tall. Panic washed over you as you flailed your arms, desperately looking for something which would keep you from falling down to the floor, and possibly death.
As if on queue, her gray shorts came back into view as her before massive cheeks had now grown to a unfathomable size, would come soaring past his miniscule body. the slick fabric started brushing against your sides as they kept you from falling, although you just kept sliding deeper and deeper, her massive crack seemingly having no end until you slid deep enough that her cheeks clasped tigher around your body. Keeping you in place.
A muffled voice would be heard outside.
"Kay little Timmy, let's do a 20 minute intense workout without breaks." She didn't even bother to look back as she rose back up, her cheeks clasping tighter and tighter around your puny body.
She would continue, jumping high into the air and spreading her legs as her cheeks would gape considerably, freeing you from inbetween her cheeks as the sudden momentum would carry you upwards, sending you flying straight into the air as you would find yourself plummet back down.
Out of sheer panic, you would grab the waistband of her shorts, finding yourself dangling inside her shorts as you gripped the band tightly, the moist surface making it quite difficult. A noticeably waterfall of sweat would form on her back, rolling down it's length and onto her bubbly buttcheeks as the stream of sweat would seek refuge inside her gaping crack, as you could feel a strong stream of liquid push against your back and drain down the inside of her shorts.